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【多选题】
全塑电缆线路的特点有（）.
A.
全塑电缆电气特性好，传输质量优良
B.
便于机械化、自动化施工
C.
维护方便、故障少、使用寿命长
D.
投资经济
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参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】Subways are underground trains, which usually operate 24 hours a day. They are found in larger cities and usually run between the suburbs and the downtown area. Maps and schedules are available from t...
A.
within downtown areas
B.
away from city centers
C.
in or outside big modern cities
D.
between suburbs and city centers